摘要:本文将带你了解iOS源码之PDF文件的浏览和涂鸦效果的简单实现,希望本文对大家学IOS有所帮助。
浏览PDF的效果
方法一:利用webview
复制代码代码如下:
-(void)loadDocument:(NSString *)documentName inView:(UIWebView *)webView { NSString *path = [[NSBundle mainBundle] pathForResource:documentName ofType:nil]; NSURL *url = [NSURL fileURLWithPath:path]; NSURLRequest *request = [NSURLRequest requestWithURL:url]; [webView loadRequest:request]; }
利:1.实现简单
2.还是实现简单
弊:1.仅能浏览,拿不到任何回调,safari不会鸟任何人。
2.固定竖版拖动,想实现翻页动效果就扒瞎
下面的方法可以解决webview 显示pdf的弊,相对的,要付出一些汗水作为代价了。
方法二:利用CGContextDrawPDFPage
复制代码代码如下:
CGPDFDocumentRef GetPDFDocumentRef(NSString *filename) { CFStringRef path; CFURLRef url; CGPDFDocumentRef document; size_t count; path = CFStringCreateWithCString (NULL, [filename UTF8String], kCFStringEncodingUTF8); url = CFURLCreateWithFileSystemPath (NULL, path, kCFURLPOSIXPathStyle, 0); CFRelease (path); document = CGPDFDocumentCreateWithURL (url); CFRelease(url); count = CGPDFDocumentGetNumberOfPages (document); if (count == 0) { printf("[%s] needs at least one page!\n", [filename UTF8String]); return NULL; } else { printf("[%ld] pages loaded in this PDF!\n", count); } return document; } void DisplayPDFPage (CGContextRef myContext, size_t pageNumber, NSString *filename) { CGPDFDocumentRef document; CGPDFPageRef page; document = GetPDFDocumentRef (filename); page = CGPDFDocumentGetPage (document, pageNumber); CGContextDrawPDFPage (myContext, page); CGPDFDocumentRelease (document); } 这样显示出来的pdf单页是倒立的,Quartz坐标系和UIView坐标系不一样所致,调整坐标系,使pdf正立: 复制代码代码如下: CGContextRef context = UIGraphicsGetCurrentContext(); CGContextTranslateCTM(context, 80, self.frame.size.height-60); CGContextScaleCTM(context, 1, -1); 配合iOS5强大的UIPageViewController实现翻页浏览 复制代码代码如下: - (PDFViewController *)viewControllerAtIndex:(NSUInteger)index { //Return the PDFViewController for the given index. if (([self.pagePDF count] == 0 )|| (index > [self.pagePDF count]) ) { return nil; } //Create a new view controller and pass suitable data. PDFViewController *dataViewController = [[PDFViewController alloc]initWithNibName:@"PDFViewController" bundle:nil]; //dataViewController.pdfview = [self.pagePDF objectAtIndex:index]; dataViewController.pdfview = [[PDFView alloc]initWithFrame:self.view.frame atPage:index]; [dataViewController.view addSubview:dataViewController.pdfview]; NSLog(@"index = %d",index); return dataViewController; } - (NSUInteger) indexOfViewController:(PDFViewController *)viewController { return [self.pagePDF indexOfObject:viewController.pdfview]; } - (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController { NSUInteger index = [self indexOfViewController:(PDFViewController *)viewController]; if ((index == 0 ) || (index == NSNotFound)){ return nil; } index--; return [self viewControllerAtIndex:index]; } - (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController { NSUInteger index = [self indexOfViewController:(PDFViewController *)viewController]; if (index == NSNotFound) { return nil; } index++; if (index == [self.pagePDF count]){ return nil; } return [self viewControllerAtIndex:index]; }
涂鸦效果
主要涉及:
1. 多context,分层画画
复制代码代码如下:
-
(void)drawLayer:(CALayer *)layer inContext:(CGContextRef)ctx 2. 触摸事件touches族那些event 复制代码代码如下: - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event …… 3. 初始化单页view传页码 复制代码代码如下: - (id)initWithFrame:(CGRect)frame onPage:(NSInteger)page 4.画轨迹方法 复制代码代码如下: CG_EXTERN void CGPathMoveToPoint(CGMutablePathRef path, const CGAffineTransform *m, CGFloat x, CGFloat y)CG_EXTERN void CGPathAddLineToPoint(CGMutablePathRef path, const CGAffineTransform *m, CGFloat x, CGFloat y)
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